package com.qk.filter;

import com.qk.utils.CurrentUserHoler;
import com.qk.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import java.io.IOException;
@Slf4j
@WebFilter(urlPatterns = "/*")
@Component
public class TokenFilter implements Filter {

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1.获取路径
        String uri = request.getRequestURI();
        //2.判断是否是登录请求,如果是就放行
        if (uri.contains("login")) {
            log.info("登录请求:{},放行",uri);
            filterChain.doFilter(request, response);
            return;
        }
        //3.获取token
        String jwt = request.getHeader("token");
        //4.判断token是否为空
        if (jwt == null || jwt.isEmpty()) {
            log.info("请求头token不存在");
            response.setStatus(401);
            return;
        }
        //5.解析令牌,如果解析令牌报错,响应401
        try {
            Claims claims = JwtUtils.parseToken(jwt);
            Integer userId=claims.get("id",Integer.class);
            log.info("当前用户,存入ThraedLocal");
            CurrentUserHoler.setCurrentUser(userId);
        }catch (Exception e){
            log.info("令牌解析错误,拦截");
            response.setStatus(401);
            return;
        }
        //6.放行
        filterChain.doFilter(request, response);

        log.info("删除");
        CurrentUserHoler.removeCurrentUser();
    }
}
